CN115580319A - GNSS-assisted cluster cooperative differential frequency hopping communication system and method - Google Patents
GNSS-assisted cluster cooperative differential frequency hopping communication system and method Download PDFInfo
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/715—Interference-related aspects
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- H—ELECTRICITY
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- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/7136—Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform
- H04B2001/71365—Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform using continuous tuning of a single frequency source
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- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
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- H04B2001/7152—Interference-related aspects with means for suppressing interference
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Abstract
The invention discloses a GNSS-assisted cluster cooperative differential frequency hopping communication system and a GNSS-assisted cluster cooperative differential frequency hopping communication method. The system consists of a central control unit and user nodes. Each node is provided with a GNSS receiver, and the GNSS receiver provides accurate position information and time information for each node. In a cluster cooperative network of differential frequency hopping communication, a central control unit distributes a series of time-space variable G function clusters to each node according to position information reported by each node and current hop frequency, and the G function clusters can be dynamically adjusted according to the number of nodes accessed into the network in real time and the set update time period. The system has the advantages that the frequency of the frequency hopping multiple users is different at the same moment, so that the crosstalk among the users can be effectively prevented; the position information provided by the GNSS receiver can ensure that the frequency hopping frequency interval of the users adjacent to the position is larger, and the multiple access interference can be effectively reduced. The method and the device can improve the differential frequency hopping communication efficiency and the anti-interference performance of the cluster cooperative system under the assistance of the GNSS.
Description
Technical Field
The invention belongs to the field of frequency hopping communication systems, and particularly relates to a Global Navigation Satellite System (GNSS) assisted cluster cooperative differential frequency hopping communication System and method.
Background
With the increasing complexity of electromagnetic environment and the increasing electronic information countermeasure, the communication system is often affected by crosstalk signals among multiple users while completing voice, data and other services. The communication system should adopt an effective communication mode to enhance the reliability of information transmission, thereby improving the anti-interference capability of the system.
The conventional frequency hopping communication adopts a Pseudo random sequence (PN) to control carrier frequency variation, so as to realize Pseudo random hopping of frequency. Differential frequency hopping is a novel spread spectrum communication technology, and is completely different from a conventional frequency hopping technology system. The difference lies in that: the working frequency point of the traditional frequency hopping is controlled by a pseudorandom sequence, and the frequency hopping sequence of the differential frequency hopping is determined by the working frequency point of the previous hop and the information of the current hop; the information transmitted by differential frequency hopping is hidden at the relative positions of the front frequency point and the rear frequency point, and the carrier wave is not modulated; the differential frequency hopping transmitter adopts DDS to directly synthesize the transmitting frequency. Based on the above different points, the differential frequency hopping communication has the following advantages: the information is transmitted by utilizing the correlation between the front frequency point and the rear frequency point, so that the potential error correction capability is realized; the residence time of each hop frequency is extremely short, the system has high-speed data transmission capability and strong tracking interference resistance; theoretically, the period of the frequency hopping pattern is infinite, so that the frequency hopping pattern is difficult to decipher and has good confidentiality; the receiving end demodulates information through the correlation of the front and back frequency hopping frequency points, does not need to track the frequency hopping of the transmitting end, belongs to asynchronous frequency hopping and does not need accurate timing.
The design of the differential frequency hopping pattern determines the performance of the differential frequency hopping communication system and the strength of the anti-interference capability. The design of the differential hopping pattern is determined by the frequency transfer function, i.e., the G-function. At the receiving end, the data information of the transmitting end can be restored through the inverse transformation of the G function. The receiver of the differential frequency hopping system adopts a broadband receiving technology to carry out symbol-by-symbol detection on a received signal or sequence detection by utilizing the correlation among frequency hopping points. The design method of the G function mainly comprises a G function method based on a linear congruence theory, a G function method based on a fuzzy and chaotic theory, a G function structure based on a cryptographic algorithm and the like. The frequency transfer function is designed based on a single G function of a certain theory or algorithm. However, in the differential frequency hopping multi-user networking communication, when a source node sends data to a target node, if the source node adopts a single G function to generate a frequency hopping frequency point set, along with the increase of the number of received frames, the fixed frequency transfer relationship is easily intercepted by a third party, thereby reducing the anti-interference performance of the target node. In addition, in the differential frequency hopping multi-user communication, because the receiving end adopts full frequency reception, multi-user data transmission occurs in a channel at the same time, and each user adopts the same G function to modulate the data, the problem of multiple access interference can be brought. Therefore, from the viewpoints of information interception and multiple access interference, the requirement of the system on interception and interference resistance is difficult to meet by using a single G function in the differential frequency hopping communication networking system. At present, cluster cooperative frequency hopping communication technology can be used in the fields of unmanned aerial vehicles, intelligent robots, mobile communication stations and the like, but crosstalk is easily generated among communication users due to the use of a single G function, and the communication quality and the efficiency are lower.
Disclosure of Invention
In order to solve the above problems, the present invention provides a GNSS-assisted cluster cooperative differential frequency hopping communication system and method, and the main idea of the present invention is: the G function of the differential frequency hopping communication system is designed by using position, velocity, time (PVT) information provided by the GNSS receiver. A central control unit in the system can distribute a series of space-time variable G function clusters for each user. The time information provided by the GNSS receiver enables the frequency of multiple users hopping at the same moment to be different, and the crosstalk among the users can be effectively prevented; the position information provided by the GNSS receiver can ensure that the frequency hopping frequency interval of the users adjacent to the position is larger, and the multiple access interference can be effectively reduced.
The invention adopts the following technical scheme:
according to an aspect of the present invention, the present invention provides a GNSS assisted trunked cooperative differential frequency hopping communication system, comprising:
the central control unit is in communication connection with the N nodes respectively, and the nodes are in communication connection;
each node comprises a GNSS receiver, a transmitting unit and a receiving unit;
information is transmitted and received among all nodes and between all nodes and a central control unit in a differential frequency hopping communication mode;
each node provides the position information and the current frequency hopping frequency of the node to a central control unit through a GNSS receiver;
the central control unit assigns corresponding frequency transfer function G to each node n ；
The transmitting unit of each node uses the received G n The function processes the input data and the frequency of the previous hop to generate a differential frequency hopping signal of the current hop, and the differential frequency hopping signal is transmitted through an antenna;
the receiving unit of each node receives the differential frequency hopping signal through the antenna, detects and decodes the differential frequency hopping signal, and simultaneously demodulates the frequency transfer function G distributed to the node by the central control unit in the data information obtained by decoding n And mixing G with n And updating the function to be the G function of the current moment of the node.
Preferably, the central control unit comprises: the frequency set distributor is connected with the N G function generators;
the frequency set allocator is used for allocating frequency sets { f) according to current hops sent by nodes 1 ,,f 2 ,…,f N And a current position information set P 1 ,P 2 ,…,P N Dividing a differential frequency hopping frequency set M into N different frequency subsets;
the frequency set distributor is further used for sending the N different frequency subsets to the corresponding N G function generators respectively;
the frequency set distributor is also used for randomly distributing G functions of different types for the N G function generators;
n G function generators for distributing corresponding frequency transfer function G to each node n 。
Preferably, the transmitting unit includes: buffer, G n The device comprises a function module, a frequency synthesizer, a first radio frequency module and a transmitting antenna;
the buffers are respectively connected with the G n Function modules are connected to the GNSS receiver, G n The function module is respectively connected with the GNSS receiver and the frequency synthesizer, the frequency synthesizer is connected with the first radio frequency module, and the first radio frequency module is connected with the transmitting antenna;
the buffer is used for carrying out data frame recombination on input data and position information output by the GNSS receiver, adding the position information into a frame header part of a data frame, and transmitting data in a frame dividing mode;
the G is n A function module for receiving time information transmitted by a GNSS receiver in the node, thereby controlling an accurate time, G, at which a frequency hopping sequence is generated n The function module determines the frequency of the current hop by the frequency of the previous hop and the information symbol to be loaded by the current hop;
the frequency synthesizer is used for generating a differential frequency hopping point according to the current frequency hopping and sending the differential frequency hopping point to the first radio frequency module;
the first radio frequency module is used for converting the differential frequency hopping frequency point into a differential frequency hopping signal through the transmitting antenna and sending the differential frequency hopping signal to a receiving unit of another node in the network;
the receiving unit includes: the system comprises a receiving antenna, a second radio frequency module, an FFT module, a signal detection module and a frequency sequence decoder;
the receiving antenna is connected with the second radio frequency module, the second radio frequency module is connected with the FFT module, the FFT module is connected with the signal detection module, and the signal detection module is respectively connected with the GNSS receiver and the frequency sequence decoder;
the receiving antenna is used for transmitting the received signal to the second radio frequency module;
the radio frequency module is used for converting the signal into an intermediate frequency signal in a down-conversion mode, and transmitting the signal to the FFT module after the signal is subjected to AD sampling by an intermediate frequency filter in the radio frequency module;
the FFT module is used for carrying out fast Fourier transform on the frequency hopping signal;
the signal detection module is used for receiving the time information sent by the GNSS receiver and detecting the signal by adopting a sequence detection method;
the frequency sequence decoder is used for carrying out frequency sequence decoding on the detected differential frequency hopping sequence, finally, the data information obtained after decoding is used as output, and the frequency transfer function G distributed to the node by the central control unit is demodulated from the data information obtained after decoding n And mixing G with n And updating the function into a frequency transfer function of the node at the current moment.
According to another aspect of the present invention, the present invention provides a GNSS-assisted cluster cooperative differential frequency hopping communication method, which is implemented based on the GNSS-assisted cluster cooperative differential frequency hopping communication system, and includes the following steps:
s1: at the updating moment, the central control unit generates a space-time differential frequency hopping G function cluster { G ] according to the current frequency hopping frequency and the position information of each node 1 ,G 2 ,…,G n ,…,G N And will correspond to G n Distributing the function to a corresponding node n;
s2: the transmitting unit of each node uses the received G n The function processes the input data and the frequency of the previous hop to generate a differential frequency hopping signal of the current hop, and transmits the differential frequency hopping signal through a transmitting antenna;
s3: the receiving unit of each node receives the differential frequency hopping signal through the receiving antenna, detects and decodes the differential frequency hopping signal, and simultaneously demodulates the frequency transfer function G distributed to the node by the central control unit in the data information obtained by decoding n And mixing G with n And updating the function to be the G function of the current time of the node.
Preferably, step S1 specifically includes:
s1.1: let T be the updated time interval, at the integral multiple time of T, each node will be the current hop frequency f n With current position information P n Sending to a frequency set allocator in the central control unit;
s1.2: the frequency set distributor divides a differential frequency hopping frequency set M into N different frequency subsets according to a current hopping frequency set and a current position information set sent by a node;
s1.3: the frequency set distributor respectively sends N different frequency subsets to corresponding N function generators;
s1.4: the frequency set distributor randomly distributes G functions of different types to the N function generators;
s1.5: the central control unit distributes corresponding G functions for each node respectively, and the central control unit outputs a series of time-space variable G function clusters;
s1.6: and each node updates the current hop frequency and the current position information once according to a fixed time interval T and reports the current hop frequency and the current position information to the central control unit again, and then the steps S1.1 to S1.5 are repeated in sequence, and a series of new space-time variable G function clusters are generated through dynamic updating.
Preferably, step S1.2 specifically comprises:
s1.2.1: the frequency set distributor draws a space-time space-occupying grid graph of each node according to the position information set and the time information set reported by the nodes;
s1.2.2: calculating the distance P between every two nodes i,j Normalizing the distance between any two nodes according to the maximum distance value in every two nodes;
s1.2.3: dividing the frequency subsets according to the principle that the closer the distance between two nodes is, the larger the frequency interval is;
s1.2.4: frequency hopping frequency set { f reported by frequency set allocator to node 1 ,,f 2 ,…,f N And monitoring.
Optionally, in step S1.4, the different types of G functions include: any one of a G function based on a linear congruence theory, a G function based on chaotic mapping, a G function based on an encryption algorithm and a G function of time-frequency disturbance.
Preferably, in step S1.6, when the number of nodes changesDuring conversion, the central control unit can re-divide different frequency subsets and change G according to the increase and decrease conditions of the position information reported by the nodes n The number of functions.
Preferably, the step S2 specifically includes:
s2.1: the buffer performs data frame recombination on the input information data and the position information output by the GNSS receiver, adds the position information to a frame header part of a data frame, and transmits data in a frame dividing mode;
s2.2: the GNSS receiver in the node inputs time information into the accurate time generated by the function control frequency hopping sequence of the node, and the function determines the frequency of the current hop by the frequency of the previous hop and the information symbol to be loaded by the current hop;
s2.3: the frequency synthesizer generates a differential frequency hopping point according to the current frequency hopping and sends the differential frequency hopping point to the first radio frequency module;
s2.4: and the first radio frequency module converts the differential frequency hopping frequency point into a differential frequency hopping signal through a transmitting antenna and sends the differential frequency hopping signal to a receiving unit of another node in the network.
Preferably, the step S3 specifically includes:
s3.1: the receiving antenna transmits the received signal to the second radio frequency module;
s3.2: the second radio frequency module converts the signal into an intermediate frequency signal in a down-conversion mode, and the signal is transmitted to the FFT module after being subjected to AD sampling by an intermediate frequency filter in the second radio frequency module;
s3.3: the FFT module carries out fast Fourier transform on the intermediate frequency signal;
s3.4: the GNSS receiver inputs time information into a signal detection module, and the signal detection module detects the signals after FFT conversion by adopting a sequence detection method;
s3.5: the frequency sequence decoder decodes the frequency sequence of the detected differential frequency hopping sequence, finally takes the decoded data information as output, and simultaneously demodulates the frequency transfer function G distributed to the node by the central control unit in the decoded data information n And mixing G with n And updating the function to be the G function of the current moment of the node.
The technical scheme provided by the invention has the beneficial effects that:
(1) The central control unit uniformly designs a G function frequency hopping cluster for the cluster cooperative differential frequency hopping communication system, allocates independent G functions for different user nodes, and each node decodes the frequency sequence by using the allocated G functions, so that the multi-address interference caused by the fact that the cluster cooperative nodes all use a single G function can be effectively avoided;
(2) A series of new space-time variable G function clusters generated by the central control unit can reduce the probability that the fixed frequency transfer relation determined by a single G function is intercepted by a third party, so that the anti-interference capability of the cluster cooperative nodes is effectively improved;
(3) The precise time information provided by the GNSS receiver is used for facilitating the precise modulation and demodulation of each node differential frequency hopping sequence and obtaining an accurate space-time variable G function cluster;
(4) Different nodes occupy different frequency points at the same time, so that crosstalk among multiple nodes can be prevented;
(5) The closer the distance between the nodes is, the larger the frequency difference is, and the multiple access interference caused by the close frequency between the nodes can be prevented;
(6) The G function of each node has time-varying property, thereby improving the confidentiality and the anti-interception capability of the system.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a block diagram of a GNSS assisted trunked cooperative differential frequency hopping communication system in an embodiment of the present invention;
FIG. 2 is a diagram of a central control unit for generating spatio-temporal variable G function clusters according to an embodiment of the present invention;
FIG. 3 is a block diagram of a GNSS assisted node transceiver unit in an embodiment of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
The first embodiment is as follows:
referring to fig. 1, fig. 1 is a block diagram of a GNSS assisted trunked cooperative differential frequency hopping communication system according to the present invention. The GNSS assisted cluster cooperative frequency hopping communication system comprises: a central control unit and nodes (node 1, node 2, … …, node N); each node comprises a GNSS receiver, which refers to a module, a chip or a physical machine capable of completing the GNSS positioning function and providing PVT information; each node comprises a transmitting unit and a receiving unit; information is transmitted and received among all nodes and between all nodes and a central control unit in a differential frequency hopping communication mode; each node provides the position information and the current frequency hopping frequency of the node to a central control unit through a GNSS receiver; the central control unit distributes corresponding frequency transfer functions to each node; the transmitting unit of each node processes the input data and the frequency of the previous hop by using the received function to generate a differential frequency hopping signal of the current hop, and transmits the differential frequency hopping signal through an antenna; and the receiving unit of each node receives the differential frequency hopping signal through the antenna, detects and decodes the differential frequency hopping signal, simultaneously demodulates the frequency transfer function distributed to the node by the central control unit in the data information obtained by decoding, and updates the function into the G function of the current moment of the node.
The invention is suitable for cluster cooperative differential frequency hopping communication systems such as unmanned planes, intelligent robots, mobile communication stations and the like, and can allocate different nodes for users in a cluster and select one of the users as a central control unit. The central control unit can respectively allocate different frequency transfer functions to each user according to the position information reported by other users and the current hop frequency information.
Referring to fig. 2, fig. 2 is a structural diagram of a central control unit for generating spatio-temporal variable G-function clusters according to the present invention. The central control unit includes: frequency set distributor and N G function generators (G) 1 Function generator, G 2 Function generator … …, G N Function generators); frequency set distributor is respectively connected with G 1 Function generator, G 2 Function generator … …, G N The function generator is connected.
Frequency set allocator for allocating frequency sets { f) according to current hop frequency set transmitted by node 1 ,,f 2 ,…,f N } and the current position information set P 1 ,P 2 ,…,P N Dividing a differential frequency hopping frequency set M into N different frequency subsets;
the frequency set distributor is also used for respectively sending the N different frequency subsets to the corresponding N G function generators;
the frequency set distributor is also used for randomly distributing G functions of different types for the N G function generators;
n G function generators for distributing corresponding frequency transfer function G to each node n 。
Referring to FIG. 3, FIG. 3 is a block diagram of a GNSS assisted node transceiver unit of the present invention. The transmitting unit in the node transceiver unit includes: buffer, G n The device comprises a function module, a frequency synthesizer, a first radio frequency module and a transmitting antenna;
the buffers are respectively connected with G n Function modules connected to GNSS receivers, G n The function module is respectively connected with the GNSS receiver and the frequency synthesizer, the frequency synthesizer is connected with the first radio frequency module, and the first radio frequency module is connected with the transmitting antenna;
the buffer is used for carrying out data frame recombination on input data and position information output by the GNSS receiver, adding the position information into a frame header part of a data frame, and transmitting data in a frame dividing mode;
G n a function module for receiving time information transmitted by a GNSS receiver in the node, thereby controlling an accurate time, G, at which a frequency hopping sequence is generated n The function module determines the frequency of the current hop by the frequency of the previous hop and the information symbol to be loaded by the current hop;
the frequency synthesizer is used for generating a differential frequency hopping point according to the current frequency hopping and sending the differential frequency hopping point to the first radio frequency module;
the first radio frequency module is used for converting the differential frequency hopping frequency point into a differential frequency hopping signal through the transmitting antenna and sending the differential frequency hopping signal to a receiving unit of another node in the network;
the receiving unit in the node transceiver unit includes: the system comprises a receiving antenna, a second radio frequency module, an FFT module, a signal detection module and a frequency sequence decoder;
the receiving antenna is connected with a second radio frequency module, the second radio frequency module is connected with an FFT module, the FFT module is connected with a signal detection module, and the signal detection module is respectively connected with a GNSS receiver and a frequency sequence decoder;
the receiving antenna is used for transmitting the received signal to the second radio frequency module;
the radio frequency module is used for down-converting the signal into an intermediate frequency signal, and transmitting the signal to the FFT module after the signal is sampled by an intermediate frequency filter AD in the radio frequency module;
the FFT module is used for carrying out fast Fourier transform on the frequency hopping signal;
the signal detection module is used for receiving the time information sent by the GNSS receiver and detecting the signal by adopting a sequence detection method;
a frequency sequence decoder for decoding the detected differential frequency hopping sequence, outputting the decoded data information, and demodulating the frequency transfer function G allocated to the node by the central control unit in the decoded data information n And combining the G n The function is updated to the G function (frequency transfer function) of the node at the current time.
Example two:
referring to fig. 1, the present embodiment provides a GNSS-assisted cluster cooperative differential frequency hopping communication method, which is implemented based on the GNSS-assisted cluster cooperative differential frequency hopping communication system of the first embodiment, and includes the following steps:
s1: at the updating moment, the central control unit generates a space-time differential frequency hopping G function cluster { G ] according to the current frequency hopping frequency and the position information of each node 1 ,G 2 ,…,G n ,…,G N And will correspond to G n Distributing the function to a corresponding node n;
s2: the transmitting unit of each node uses the received G n Function, for input data and last hopProcessing the frequency to generate a differential frequency hopping signal of the current hop, and transmitting the differential frequency hopping signal through a transmitting antenna;
s3: the receiving unit of each node receives the differential frequency hopping signal through the receiving antenna, detects and decodes the differential frequency hopping signal, and simultaneously demodulates the frequency transfer function G distributed to the node by the central control unit in the data information obtained by decoding n And combining the G n And updating the function to be the G function of the current moment of the node.
As a preferred embodiment, referring to fig. 3, step S1 specifically includes:
s1.1: at integral multiple time of T (T is updated time interval), each node sends the current hop frequency f n With current position information P n Sending to a frequency set distributor in the central control unit;
s1.2: the frequency set distributor divides the differential frequency hopping frequency set M into N different frequency subsets according to the current hopping frequency set and the current position information set sent by the nodes;
s1.3: the frequency set distributor respectively sends the N different frequency subsets to the corresponding N function generators;
s1.4: the frequency set distributor randomly distributes G functions of different types to the N function generators;
s1.5: the central control unit distributes corresponding G functions for each node respectively, and the central control unit outputs a series of time-space variable G function clusters;
s1.6: and each node updates the current hop frequency and the current position information once according to a fixed time interval T and reports the current hop frequency and the current position information to the central control unit again, and then the steps S1.1 to S1.5 are repeated in sequence, and a series of new space-time variable G function clusters are generated through dynamic updating.
Further, step S1.2 specifically includes:
s1.2.1: the frequency set distributor draws a space-time space-occupying grid graph of each node according to the position information set and the time information set reported by the nodes;
s1.2.2: calculating the distance P between every two nodes i,j That is, the distance between any two nodes is normalized according to the maximum value of the distance between every two nodes;
s1.2.3: dividing the frequency subsets according to the principle that the closer the distance between two nodes is, the larger the frequency interval is;
s1.2.4: frequency hopping frequency set { f reported by frequency set allocator to node 1 ,,f 2 ,…,f N And monitoring.
As an alternative embodiment, in step S1.4, the different types of G functions include: any one of a G function based on a linear congruence theory, a G function based on chaotic mapping, a G function based on an encryption algorithm and a G function of time-frequency disturbance.
Furthermore, in step S1.6, when the number of nodes changes, the central control unit can re-partition different frequency subsets and change G according to the increase and decrease of the location information reported by the nodes n The number of functions.
As a preferred implementation, referring to fig. 3, at the transmitting end, step S2 specifically includes:
s2.1: the buffer carries out data frame recombination on the input information data and the position information output by the GNSS receiver, adds the position information into a frame header part of the data frame, and transmits the data in a framing mode;
s2.2: a GNSS receiver in a node inputs time information into the accurate time generated by a function control frequency hopping sequence of the node, and the function determines the frequency of the current hop by the frequency of the previous hop and the information symbol to be loaded by the current hop;
s2.3: the frequency synthesizer generates a differential frequency hopping point according to the current frequency hopping and sends the differential frequency hopping point to the first radio frequency module;
s2.4: the first radio frequency module converts the differential frequency hopping frequency point into a differential frequency hopping signal through a transmitting antenna and sends the differential frequency hopping signal to a receiving unit of another node in the network.
As a preferred implementation, referring to fig. 3, at the receiving end, step S3 specifically includes:
s3.1: the receiving antenna transmits the received signal to the second radio frequency module;
s3.2: the second radio frequency module down-converts the signal into an intermediate frequency signal, and the intermediate frequency signal is subjected to AD sampling by an intermediate frequency filter in the second radio frequency module and then is transmitted to the FFT module;
s3.3: the FFT module carries out fast Fourier transform on the intermediate frequency signal;
s3.4: the GNSS receiver inputs the time information into a signal detection module, the signal detection module detects the signal after FFT conversion by adopting a sequence detection method, and the sequence detection method can adopt L jump (L is set randomly) in sequence length as a judgment period;
s3.5: the frequency sequence decoder decodes the frequency sequence of the detected differential frequency hopping sequence, finds out possible frequency transfer paths through the frequency sequence decoder, and combines the incoherent detection in a linear combination mode, a product combination mode and other common combination modes. The linear combination is that the detected values are added and combined, and then sent to a decision device to be used as a decision variable for decision. Finally, the data information of the sending end obtained after decoding is used as output, and the frequency transfer function G distributed to the node by the central control unit can be demodulated while the data information obtained after decoding is decoded n And mixing G with n The function is updated to the frequency transfer function (G-function) of the node at the current time. Finally, the frequency transfer function is stored in the function of the transmitting unit.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third and the like do not denote any order, but rather the words first, second and the like may be interpreted as indicating any order.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A GNSS assisted trunked cooperative differential frequency hopping communications system, comprising:
the central control unit is in communication connection with the N nodes respectively, and the nodes are in communication connection;
each node comprises a GNSS receiver, a transmitting unit and a receiving unit;
information is transmitted and received among all nodes and between all nodes and a central control unit in a differential frequency hopping communication mode;
each node provides the position information and the current frequency hopping frequency of the node to a central control unit through a GNSS receiver;
the central control unit assigns corresponding frequency transfer function G to each node n ；
The transmitting unit of each node uses the received G n The function processes the input data and the frequency of the previous hop to generate a differential frequency hopping signal of the current hop, and the differential frequency hopping signal is transmitted through an antenna;
the receiving unit of each node receives the differential frequency hopping signal through the antenna, detects and decodes the differential frequency hopping signal, and simultaneously demodulates the frequency transfer function G distributed to the node by the central control unit in the data information obtained by decoding n And mixing G with n And updating the function to be the G function of the current moment of the node.
2. The GNSS assisted trunked cooperative differential frequency hopping communication system of claim 1, wherein the central control unit comprises: the frequency set distributor is connected with the N G function generators;
the frequency set allocator is used for allocating frequency sets { f) according to current hops sent by nodes 1 ,,f 2 ,…,f N And a current position information set P 1 ,P 2 ,…,P N Dividing a differential frequency hopping frequency set M into N different frequency subsets;
the frequency set distributor is further configured to send the N different frequency subsets to the corresponding N G function generators, respectively;
the frequency set distributor is also used for randomly distributing G functions of different types for the N G function generators;
n G function generators for distributing corresponding frequency transfer function G to each node n 。
3. The GNSS assisted trunked cooperative differential frequency hopping communication system of claim 1, wherein the transmitting unit comprises: buffer, G n The device comprises a function module, a frequency synthesizer, a first radio frequency module and a transmitting antenna;
the buffers are respectively connected with the G n Function modules are connected to the GNSS receiver, G n The function module is respectively connected with the GNSS receiver and the frequency synthesizer, the frequency synthesizer is connected with the first radio frequency module, and the first radio frequency module is connected with the transmitting antenna;
the buffer is used for carrying out data frame recombination on input data and position information output by the GNSS receiver, adding the position information into a frame header part of a data frame, and transmitting data in a frame dividing mode;
the G is n A function module for receiving time information transmitted by a GNSS receiver in the node, thereby controlling an accurate time, G, at which a frequency hopping sequence is generated n The function module determines the frequency of the current hop by the frequency of the previous hop and the information symbol to be loaded by the current hop;
the frequency synthesizer is used for generating a differential frequency hopping point according to the current frequency hopping and sending the differential frequency hopping point to the first radio frequency module;
the first radio frequency module is used for converting the differential frequency hopping points into differential frequency hopping signals through the transmitting antenna and transmitting the differential frequency hopping signals to a receiving unit of another node in the network;
the receiving unit includes: the system comprises a receiving antenna, a second radio frequency module, an FFT module, a signal detection module and a frequency sequence decoder;
the receiving antenna is connected with the second radio frequency module, the second radio frequency module is connected with the FFT module, the FFT module is connected with the signal detection module, and the signal detection module is respectively connected with the GNSS receiver and the frequency sequence decoder;
the receiving antenna is used for transmitting the received signal to the second radio frequency module;
the radio frequency module is used for converting the signal into an intermediate frequency signal in a down-conversion mode, and transmitting the signal to the FFT module after the signal is subjected to AD sampling by an intermediate frequency filter in the radio frequency module;
the FFT module is used for carrying out fast Fourier transform on the frequency hopping signal;
the signal detection module is used for receiving the time information sent by the GNSS receiver and detecting the signal by adopting a sequence detection method;
the frequency sequence decoder is used for carrying out frequency sequence decoding on the detected differential frequency hopping sequence, finally, the data information obtained after decoding is used as output, and the frequency transfer function G distributed to the node by the central control unit is demodulated from the data information obtained after decoding n And mixing G with n And updating the function into a frequency transfer function of the node at the current moment.
4. A GNSS-assisted cluster cooperative differential frequency hopping communication method is characterized by comprising the following steps:
s1: at the updating moment, the central control unit generates a space-time differential frequency hopping G function cluster { G ] according to the current frequency hopping frequency and the position information of each node 1 ,G 2 ,…,G n ,…,G N And will correspond to G n Distributing the function to a corresponding node n;
s2: the transmitting unit of each node uses the received G n The function processes the input data and the frequency of the previous hop to generate a differential frequency hopping signal of the current hop, and transmits the differential frequency hopping signal through a transmitting antenna;
s3: the receiving unit of each node receives the differential frequency hopping signal through the receiving antenna, detects and decodes the differential frequency hopping signal, and simultaneously demodulates the frequency transfer function G distributed to the node by the central control unit in the data information obtained by decoding n And mixing G with n And updating the function to be the G function of the current time of the node.
5. The GNSS assisted cluster cooperative differential frequency hopping communication method according to claim 4, wherein the step S1 specifically comprises:
s1.1: let T be the updated time interval, at the integral multiple time of T, each node will be the current hop frequency f n With current position information P n Sending to a frequency set distributor in the central control unit;
s1.2: the frequency set distributor divides a differential frequency hopping frequency set M into N different frequency subsets according to a current hopping frequency set and a current position information set sent by a node;
s1.3: the frequency set distributor respectively sends N different frequency subsets to corresponding N function generators;
s1.4: the frequency set distributor randomly distributes G functions of different types to the N function generators;
s1.5: the central control unit distributes corresponding G functions for each node respectively, and the central control unit outputs a series of time-space variable G function clusters;
s1.6: and each node updates the current hop frequency and the current position information once according to a fixed time interval T and reports the current hop frequency and the current position information to the central control unit again, and then the steps S1.1 to S1.5 are repeated in sequence, and a series of new space-time variable G function clusters are generated through dynamic updating.
6. The GNSS assisted cluster cooperative differential frequency hopping communication method according to claim 5, wherein the step S1.2 specifically comprises:
s1.2.1: the frequency set distributor draws a space-time space-occupying grid graph of each node according to the position information set and the time information set reported by the nodes;
s1.2.2: calculating the distance P between every two nodes i,j Normalizing the distance between any two nodes according to the maximum distance value in every two nodes;
s1.2.3: dividing frequency subsets according to the principle that the closer the distance between two nodes is, the larger the frequency interval is;
s1.2.4: frequency hopping frequency set { f reported by frequency set allocator to node 1 ,,f 2 ,…,f N And monitoring.
7. The GNSS assisted cluster cooperative differential frequency hopping communication method according to claim 4, wherein in step S1.4, the different types of G functions include: any one of a G function based on a linear congruence theory, a G function based on chaotic mapping, a G function based on an encryption algorithm and a G function of time-frequency disturbance.
8. The GNSS assisted cluster cooperative differential frequency hopping communication method according to claim 4, wherein in step S1.6, when the number of nodes changes, the central control unit can re-partition different frequency subsets and change G according to the increase and decrease of the position information reported by the nodes n The number of functions.
9. The GNSS assisted cluster cooperative differential frequency hopping communication method according to claim 4, wherein the step S2 specifically comprises:
s2.1: the buffer carries out data frame recombination on the input information data and the position information output by the GNSS receiver, adds the position information into a frame header part of a data frame, and transmits data in a frame dividing mode;
s2.2: the GNSS receiver in the node inputs time information into the accurate time generated by the function control frequency hopping sequence of the node, and the function determines the frequency of the current hop by the frequency of the previous hop and the information symbol to be loaded by the current hop;
s2.3: the frequency synthesizer generates a differential frequency hopping point according to the current frequency hopping and sends the differential frequency hopping point to the first radio frequency module;
s2.4: and the first radio frequency module converts the differential frequency hopping frequency point into a differential frequency hopping signal through a transmitting antenna and sends the differential frequency hopping signal to a receiving unit of another node in the network.
10. The GNSS assisted cluster cooperative differential frequency hopping communication method according to claim 4, wherein the step S3 specifically comprises:
s3.1: the receiving antenna transmits the received signal to the second radio frequency module;
s3.2: the second radio frequency module down-converts the signal into an intermediate frequency signal, and the intermediate frequency signal is sampled by an intermediate frequency filter AD in the second radio frequency module and then transmitted to an FFT module;
s3.3: the FFT module carries out fast Fourier transform on the intermediate frequency signal;
s3.4: the GNSS receiver inputs time information into a signal detection module, and the signal detection module detects the signals after FFT conversion by adopting a sequence detection method;
s3.5: the frequency sequence decoder decodes the frequency sequence of the detected differential frequency hopping sequence, finally takes the decoded data information as output, and simultaneously demodulates the frequency transfer function G distributed to the node by the central control unit in the decoded data information n And mixing G with n And updating the function to be the G function of the current moment of the node.
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